.mce-content-body pdf\:barcode {
    display: block;
    width: 100px;
    height: 100px;
    background: #F2F2F2;
    border: 1px solid #CCCCCC;
}

.mce-content-body pdf\:barcode:after {
    content: 'Barcode';
    position: absolute;
    font-size: 8pt;
}
